package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.Collections;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartsServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;
    /*添加购物车*/
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        //判断当前加入到购物车中的商品是否已经存在了

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
                //集合不为空，且有数据说明商品已经存在了
        //如果已经存在了，只需要将数量加一
        if(list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);

            cart.setNumber(cart.getNumber() + 1);//在原先的数量基础上+1
            //执行数据库update
            shoppingCartMapper.updateNumberById(cart);

        }else {
            //如果不存在，则需要插入一条购物车数据

                //首先判断添加到购物车的是菜品还是套餐
            Long dishId = shoppingCart.getDishId();
            if(dishId != null) {
                //本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else{
                //本次添加到购物车的是套餐
                Long setmealId = shoppingCart.getSetmealId();

                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());

            shoppingCartMapper.insert(shoppingCart);
        }
    }
    /*查看购物车*/
    @Override
    public List<ShoppingCart> showShoppingCart() {
        //获取到当前用户的id
        Long userId = BaseContext.getCurrentId();
        ShoppingCart build = ShoppingCart.builder().userId(userId).build();

        List<ShoppingCart> list = shoppingCartMapper.list(build);
        return list;
    }

    /*清空购物车*/
    @Override
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    /*删除购物车中一个商品*/
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //获取当前用户的id
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0) {
            ShoppingCart shoppingCart1 = list.get(0);
            //获取商品的数量
            Integer number = shoppingCart1.getNumber();
            if(number == 1) {
                shoppingCartMapper.deleteById(shoppingCart1.getId());
            }
            if(number >=2){
                shoppingCart1.setNumber(number-1);
                shoppingCartMapper.updateNumberById(shoppingCart1);
            }
        }


    }


}
